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Continental Dynamics 1996年第2期 146-155页

作者： Li Haibing Xu Zhiqin and Chen Wen(Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China)

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关键词： intracontinental deformation large-scale sinistral strike-slip shearing zone South Kunlun fault zone East Kunlun, Dongdatan and Xidatan

Late Jurassic intracontinental Extension and Related Mineralisation in Southwestern Fujian Province of SE China:Insights from deformation and Syn-Tectonic Granites

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Journal of Earth Science 2021年第1期32卷 158-173页

作者： Rui Cao Xinghua Ma Leon Bagas Yongbao Gao Demin Liu Zailai Mou Kay Laboratory of Earth Exploration and Information Techniques Ministry of educationChengdu University of TechnologyChengdu 610059China State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesBeijing 100083China Xi'an Center of China Geological Survey Xi'an 710054China Centre for Exploration Targeting the University of Western AustraliaCrawley WA 6009Australia MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China School of Earth Sciences China University of GeosciencesWuhan 430074China

Late Mesozoic igneous intrusions and extensional structures in Carboniferous to Permian sequences in the SW Fujian region acted as important controls on the localisation of Fe-polymetallic *** we document the identification of extensional deformation at shallow crustal levels and syn-tectonic granites related to normal *** on spatial distribution and structural features,the extensional deformation can be divided into cover-only and basement-intersecting styles.A series of syn-tectonic plutons were emplaced into the footwall of normal *** samples of the Tangquan Granite have high SiO2(66.4 wt.%-73.9 wt.%)assays and Mg#values(37-59).The samples also have relatively homogenous initial 87Sr/86Sr(0.7083-0.7089)andεNd(-9.2--10.2)*** and isotopic evidences indicate that the Tangquan granite originates from a hybrid source including lower crustal-derived felsic and lithospheric mantle-derived mafic *** U-Pb dating indicates that the granodiorite phase from the pluton crystallised at 161±4 Ma and the monzogranite phase crystallised at 159±1 *** with the granitic rocks in a wider region of SE China,the widespread granitic magmatism and polymetallic mineralisation have been synchronous during the Late Mesozoic,probably resulting from extensional tectonics related to the lithospheric thinning.

关键词： extensional tectonic intracontinental deformation granitic magmatism mineralisation SE China

Mesozoic Tectonothermal Evolution of the Southern Central Asian Orogenic Belt: Evidence from Apatite Fission-Track Thermochronology in Shalazha Mountain, Inner Mongolia

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Journal of Earth Science 2023年第1期34卷 37-53页

作者： Heng Peng Jianqiang Wang Chiyang Liu Shaohua Zhang Yazhuo Niu Tianbing Zhang Bo Song Wei Han State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi’an710069China School of Earth Sciences and Engineering Xi’an Shiyou UniversityXi’an710065China Xi’an Center of Geological Survey China Geological SurveyXi’an710054China

Mesozoic intracontinental orogeny and deformation were widespread within the southern Central Asian Orogenic Belt(CAOB). Chronological constraints remain unclear when assessing the Mesozoic evolution of the central segment of this region. The tectonic belt of Shalazha Mountain located in the center of this region is an ideal place to decode the deformation process. Apatite fission-track(AFT) thermochronology in Shalazha Mountain is applied to constrain the Mesozoic tectonothermal evolution of the central segment of southern CAOB. The bedrock AFT ages range from 161.8 ± 6.9 to 137.0 ± 7.3 Ma, and the first reported detrital AFT obtained from Lower Cretaceous strata shows three age peaks: P1(ca. 178 Ma), P2(ca. 149 Ma) and P3(ca. 105.6 Ma). Bedrock thermal history modeling indicates that Shalazha Mountain have experienced three stages of differential cooling: Late Triassic–Early Jurassic(~230–174 Ma), Late Jurassic–Earliest Cretaceous(~174–135 Ma) and later(~135 Ma). The first two cooling stages are well preserved by the detrital AFT thermochronological result(P1, P2) from the adjacent Lower Cretaceous strata, while P3(ca. 105.6 Ma) records coeval volcanic activity. Furthermore, our data uncover that hanging wall samples cooled faster between the Late Triassic and the Early Cretaceous than those from the footwall of Shalazha thrust fault, which synchronizes with the cooling of the Shalazha Mountain and implies significant two-stage thrust fault activation between ca. 230 and 135 Ma. These new low-temperature thermochronological results from the Shalazha Mountain region and nearby reveal three main phases of differential tectonothermal events representing the Mesozoic reactivation of the central segment of the southern CAOB. In our interpretations, the initial rapid uplift in the Late Triassic was possibly associated with intracontinental orogenesis of the CAOB. Subsequent Middle Jurassic–Earliest Cretaceous cooling is highly consistent with the Mesozoic intense intrap

关键词： intracontinental deformation Shalazha Mountain southern Central Asian Orogenic Belt apatite apatite fission-track thermal history modeling exhumation

When will it end? Long-lived intracontinental reactivation in central Australia

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Geoscience Frontiers 2019年第1期10卷 149-164页

作者： Raphael Quentin de Gromard Christopher L.Kirkland Heather M.Howard Michael T.D.Wingate Fred Jourdan Brent I.A.Mc Innes Martin Danisik Noreen J.Evans Bradley J.McDonald R.Hugh Smithies Geological Survey of Western Australia Department of Mines Industry Regulation and Safety School of Earth and Planetary Science/John de Laeter Centre/TIGeR Curtin University

The post-Mesoproterozoic tectonometamorphic history of the Musgrave Province, central Australia, has previously been solely attributed to intracontinental compressional deformation during the 580 -520 Ma Petermann Orogeny. However, our new structurally controlled multi-mineral geochronology results,from two north-trending transects, indicate protracted reactivation of the Australian continental interior over ca. 715 million years. The earliest events are identified in the hinterland of the orogen along the western transect. The first tectonothermal event, at ca. 715 Ma, is indicated by40 Ar/39 Ar muscovite and U e Pb titanite ages. Another previously unrecognised tectonometamorphic event is dated at ca. 630 Ma by Ue Pb analyses of metamorphic zircon rims. This event was followed by continuous cooling and exhumation of the hinterland and core of the orogen along numerous faults, including the Woodroffe Thrust,from ca. 625 Ma to 565 Ma as indicated by muscovite, biotite, and hornblende40 Ar/39 Ar cooling ages. We therefore propose that the Petermann Orogeny commenced as early as ca. 630 Ma. Along the eastern transect,40 Ar/39 Ar muscovite and zircon(Ue Th)/He data indicate exhumation of the foreland fold and thrust system to shallow crustal levels between ca. 550 Ma and 520 Ma, while the core of the orogen was undergoing exhumation to mid-crustal levels and cooling below 600-660℃. Subsequent cooling to 150 -220℃ of the core of the orogen occurred between ca. 480 Ma and 400 Ma(zircon [Ue Th]/He data)during reactivation of the Woodroffe Thrust, coincident with the 450 -300 Ma Alice Springs *** of the footwall of the Woodroffe Thrust to shallow depths occurred at ca. 200 Ma. More recent tectonic activity is also evident as on the 21 May, 2016(Sydney date), a magnitude 6.1 earthquake occurred, and the resolved focal mechanism indicates that compressive stress and exhumation along the Woodroffe Thrust is continuing to the present day. Overall, these results

关键词： intracontinental deformation Thermochronology Petermann orogen Musgrave Province Plate tectonics Cratonization

Polyphase Tectonic Events and Cenozoic Basin-Range Coupling in the Tianshan Belt,Northwestern China

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Acta Geologica Sinica(English Edition) 2003年第4期77卷 457-467页

作者： SHULiangshu WANGBo YANGFan LUHuafu J.CHARVET S.LAURENT-CHARVET DepartmentofEarthSciencesandStateKeyLaboratoryofMetallization NanjingUniversityNanfingJiangsu210093China InstituteofEarthSciences OrleansUniversity45067OrleansFrance

Studies show that the Tianshan orogenic belt was built in the late stage of the Paleozoic, as evidenced by the Permian red molasses and foreland basins, which are distributed in parallel with the Tianshan belt, indicating that an intense folding and uplifting event took place. During the Triassic, this orogenic belt was strongly eroded, and basins were further developed. Starting from the Jurassic, a within-plate regional extension occurred, forming a series of Jurassic-Paleogene extensional basins in the peneplaned Tianshan region. Since the Neogene, a collision event between the Indian and the Eurasian plates that took place on the southern side of the Tianshan belt has caused a strong intra-continental orogeny, which is characterized by thrusting and folding. Extremely thick coarse conglomerate and sandy conglomerate of the Xiyu Formation of Neogene System were accumulated unconformably on the Tianshan piedmont. Studies have revealed that the strong compression caused by the Indian-Eurasian collision had a profound influence over the orogenic belt in the hinterland, and MesozoiC-Cenozoic brittle deformed structures superposed on the ductile deformed Paleozoic rocks. The Mesozoic extensional basins were converted into Cenozoic compressional basins. The deformation in the basins is featured by step thrusts and fault-related folds. Statistics of joints show that the principal compressive stress since the Neogene is in a N-S direction. Meanwhile, owing to the underthrusting of the basin toward the orogenic belt, the Paleozoic strata were thrust on the Meso-Cenozoic rocks as tectonic slices, revealing distinct kinematic features in different geologic units. The basin-range coupling zones are characterized by intensive compression, folding and thrusting, accompanied by local sub-E-W-trending strike-slip faults. In the Tianshan region, Cenozoic thrusting is the most common basin-range coupling mode. The folding and faulting of Mesozoic sedimentary rocks, spontaneous com

关键词： intracontinental deformation polyphase deformation structure basin-range coupling Cenozoic Tianshan region